More than a quarter of criminals prosecuted for knife offences in West Mercia have already been caught carrying a blade, figures show.

New Ministry of Justice data reveals that West Mercia Police convicted or cautioned 259 people in the 12 months to June, either for possession of a knife as a weapon or threatening someone with one.

Of those 75, or 29%, had at least one previous offence for carrying a knife, and 12 of the criminals had three or more past offences.

That figure has increased by 21% since 2014-15, when 62 of those successfully prosecuted had reoffended. Police bosses say this could be down to improved identification techniques.

Patrick Green, chief executive of anti-knife charity the Ben Kinsella Trust, said the figures were "deeply depressing" and showed enforcement cannot prevent knife crime on its own.

"This indicates we cannot rely solely on enforcement if we are going to tackle the small but significant number of habitual reoffenders.

"These are people who are stuck in a spiral of violent crime."

Mr Green said treating knife crime as a public health issue, which is beginning to be adopted in some parts of the country, could start to tackle the “underlying causes of knife crime”.

Across England and Wales the number of reoffenders increased by 35% over the last three years.

In West Mercia, in 2017-18, 38 children were charged with knife offences. This was a 9% rise on 2014-15.

Mr Green continued: “I’m confident that a public health approach will work, it will stop the next youngsters getting caught in the cycle of violent crime.

“It won’t work immediately, but given time, as we’ve seen in Glasgow and US cities, if it’s properly funded it can be successful.”

A National Police Chiefs' Council spokesman said: "Proactive policing, and a rise in successful identification of knife carriers by forces, has played a role in the rising number of knife-carrying offences that are prosecuted.

"In many cases, police forces have improved the identification of those who continue to carry knives despite previous sanctions, which has led to a rise in the number of those with previous convictions or cautions being charged."

He explained that preventing youngsters from carrying knives requires help through education and the community, as well as the police.

"This early intervention plays a vitally important role in stopping young people from turning to a life of crime.”

Overall 21% fewer people were successfully prosecuted by West Mercia Police with knife offences in 2017-18, compared with the previous 12 months.

Of those 255 were for possession of a knife as a weapon, and four for making threats with a knife.

A total of 64 offenders were sent to prison, 43 were given community orders and 54 received a caution.

A Ministry of Justice spokeswoman explained that the proportion of knife offences resulting in a caution across England and Wales was at its lowest level ever.

She said: "Through the Government’s Serious Violence Strategy we are working to prevent young people from ever picking up a knife in the first place and our latest figures show we are catching and prosecuting more of those carrying a blade, and sending them to prison for longer.

"This year over a third of all knife and offensive weapon offences resulted in time behind bars."